论文标题
$^{139} $ la nmr调查晶格，充电和旋转动态之间的相互作用，负责订购高$ t_c $ cuprate la $ _ {1.875} $ ba $ _ {0.125} $
$^{139}$La NMR investigation of the interplay between the lattice, charge, and spin dynamics in charge ordered high $T_c$ cuprate La$_{1.875}$Ba$_{0.125}$CuO$_{4}$
论文作者
论文摘要
We investigate the interplay between the lattice, charge, and spin dynamics in charge ordered high $T_c$ cuprate La$_{1.875}$Ba$_{0.125}$CuO$_{4}$ ($T_{c} =4$~K) based on the inverse Laplace transform (ILT) analysis of the $^{139}$La nuclear spin-lattice放松率$ 1/t_1 $（在此之后称为Iltt $ _ {1} $分析）。 ILTT $ _ {1} $分析的主要推力是，可以推断出概率密度函数$ p（1/t_1）$的分布式$ 1/t_1 $。我们证明$ 1/t_ {1}^{lm} $，定义为$ p（1/t_1）$的对数平均值（即重心中心），可以通过$ 1/t_ {1}^{str} $从现象中$ 1/t $ persoted the $ poss $ poss $ pock（1/t_1）$进行$ 1/t_的$ posementic tose $ posected（1），$ posectect fit（1）晶格，充电和旋转波动及其分布在$ t_ {calle} \ sim 54 $ 〜k的远程充电订单附近发展。进入收费有序状态后，以$ t_ {spin}^{μsr} \ simeq 35 $ 〜K的差异增加了$ 1/t_ {1}^{lm} $，伴随着$ p（1/t_1）$的不对称扩展。即使是在充电状态的深处，$ 1/t_ {1} $在$^{139} $ la站点的逐渐减小的分数逐渐减少，并且随着温度的降低，对于规范超导CUO $ _2 $平面而言预期的，而没有增强自旋波动。这种规范$^{139} $ la站点的一部分几乎消失在$ \ simeq 40 $ 〜k上。相反，$^{139} $ la网站的近一半是la $ _ {1.885} $ sr $ _ {0.115} $ cuo $ $ _ {4} $（$ t_ {callage} \ simeq 80 $ 〜k）仍然没有增强的spin $ t $ t__ k）= k附近，仍然没有增强规范的行为。这些对比行为解释了为什么在la $ _ {1.875} $ ba $ _ {0.125} $ cuo $ _ {4} $中的超导率与LA $ _ {1.885} $ _ {0.115} $ CUO $ $ cuo $ _} $ puromed puromed and pushere punherseposity的抑制更大。
We investigate the interplay between the lattice, charge, and spin dynamics in charge ordered high $T_c$ cuprate La$_{1.875}$Ba$_{0.125}$CuO$_{4}$ ($T_{c} =4$~K) based on the inverse Laplace transform (ILT) analysis of the $^{139}$La nuclear spin-lattice relaxation rate $1/T_1$ (dubbed ILTT$_{1}$ analysis here after). A major thrust of the ILTT$_{1}$ analysis is that one can deduce the probability density function $P(1/T_1)$ of distributed $1/T_1$. We demonstrate that $1/T_{1}^{lm}$, defined as the log-mean (i.e. the center of gravity on a logarithmic scale) of $P(1/T_1)$, can be well approximated by $1/T_{1}^{str}$ deduced from the phenomenological stretched fit, however, $P(1/T_1)$ can provide much richer insight into how the lattice, charge, and spin fluctuations and their distribution develop near and below the long range charge order at $T_{charge} \sim 54$~K. Upon entering the charge ordered state, a divergent increase of $1/T_{1}^{lm}$ toward the spin ordering at $T_{spin}^{μSR} \simeq 35$~K is accompanied by an asymmetric broadening of $P(1/T_1)$. Even deep inside the charge ordered state, $1/T_{1}$ at a gradually diminishing fraction of $^{139}$La sites continues to slow down as temperature is lowered, as expected for canonical superconducting CuO$_2$ planes without enhanced spin fluctuations. The fraction of such canonical $^{139}$La sites almost disappears by $\simeq 40$~K. In contrast, nearly a half of the $^{139}$La sites in La$_{1.885}$Sr$_{0.115}$CuO$_{4}$ ($T_{charge} \simeq 80$~K) still exhibits the canonical behavior without enhanced spin fluctuations even near its $T_{c} = 31$~K. These contrasting behaviors explain why superconductivity in La$_{1.875}$Ba$_{0.125}$CuO$_{4}$ is more strongly suppressed than in La$_{1.885}$Sr$_{0.115}$CuO$_{4}$ despite the lower onset temperature of the charge order.
